BMO is lacking an easy way to recover from servicing failure

[jacob-anders]

What steps did you take and what happened:
When a servicing operation (e.g. firmware update) fails, the BMH ends up in servicing error and there is no easy way to recover from it (other than deleting metal3 pod)

What did you expect to happen:
I'd hope to see a feature in BMO that allows the operator to handle this more cleanly

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]
Proposed fix incoming

Environment:

• Baremetal Operator version: main branch
• Environment dev-scripts

/kind bug

[dtantsur]

/triage accepted